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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04955a0558332341a7d969fd43157e5637cc479d43ef7ad3826fa638fe9b9b08' 
  AND token = 'gGD4fNviydFA3n7en8z4W3CEHjm7Ah2PYT9r4d5ZJnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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