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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4f1425cca9cac6df38fe79ffe05c44e82abba75ab3c620ad9dc62fd248ff2c' 
  AND token = 'DRTZP5LqBKT4FD1wuyXMKE2CaXtMqqqyfbsxbg5WhQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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