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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8e37a1a8d2fc9a1cf65c1798a821c7ab1b90370cd31ab4d7db962791c084fe' 
  AND token = '6m8FRePcnuLeF/9d31UeiFmNisWLWiuaVR/HwUpKqGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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