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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30ac5cd3ff994f7f402e51dee6a68cad0c9ab210e79cbc319c20ef0aa4b9d9a' 
  AND token = 'W319H4iwHP+NSkPjDmxgu5Yu+0QaGm753CA+mb2I5X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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