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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4204b8e0f2545e244281ba24b83ffe489176aa9f571d714b811977ed2a5063a1' 
  AND token = '4zyQjkybGbPVMEd2up5VLAK6AOraTEB829EqK3cBgYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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