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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671b65433c7e52b9ce0790dbf08124ba9bd4fceb3b5c47c6353f81c94cd9c966' 
  AND token = '7Ya2hEXWS7fvI/kkpd35b8+LxeyaPDW+6UgdrOBbfHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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