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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9de8b1cb9812b771a9f815719fbe27ea38566583379fc13595f2294ac8f9a5' 
  AND token = 'Sjx7bRDW522hpSVUeZsQEEQXSp+fGEYS3u2rHkDV828=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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