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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04f4e68cfa3c6381c5c7df6632a0142f0825a0ae0efd90a2147adb261ac9e89' 
  AND token = 'vq88c4RLt02xSGQEIfd5MbqCjH+oOlQg5QEuRmJx3oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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