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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c984ce1bf1f959fa03909583d609c2b8d0cd33641649e3ef811d3c2ecd83e4b' 
  AND token = 'YxFnN0Ol8+zineLAi2ZOGz1dLAUbbpP7z35Xhr4mUpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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