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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c284c162aa816457e22d89c9f5d331e6b50c21d3313d65b17456eaadb1a695eb' 
  AND token = 'n465oIHtNRxpI1z/CmBcYO43VwwIt/oVFMYpAzU1BC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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