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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e7ff7246bed6c1fdb9c80980bee0796b0000a66e01c59845d82d25a2130fe8' 
  AND token = 'UJKdVgmxRog3et+iP66iMgZdm5+sMh6NhggTw6heCjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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