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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c54ac1f952668ff2a0ad7b418e8eb637f495d523d64b706e6bea76ff555f535' 
  AND token = '3bzpu/XVmt3qrwk+zuSZl9W/wqaoSyM3qpNsOO1WkUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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