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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff099865eaabad1e7b1b1183c85abf132370b16f837e728cb9107d48aec1bc8f' 
  AND token = '3IaZVxCaRDzWaC54GoCt+wFqGHW3z3OiI7hQfMVDDTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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