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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ec37dffc6b621acbe9420c825741e70aa7a535ab78a72f342d9798c96fec34' 
  AND token = 'Q5o9qd/+Ri7UfrQp+Fa/vQax8GJVb9jYBmyafcDDO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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