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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdb0702f4e190e68d642357b30a825849eb4e4bb6e0ccc216f4786583571b4e' 
  AND token = 'cei/hkm80rIXvjNeQumwAEEm85V11fUKFWPb7h7xzHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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