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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0057d5a329b6c6c6b62dc6a31099638b0843734095ed9a6bf515beabf5d0c508' 
  AND token = '0Nt+9G65OI2ODt6wNGmhH+3/IjUE9Je9A7oouKi27xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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