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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e904e7992b332bdb2e660980d1e3af61ea514b3b0ed29bdc1bcbd8de2e49bf9c' 
  AND token = 'jdYZGgtD+/vC/scUT4D0Q5dKaDhIrCQd6k0Gzaw/pS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}