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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970e45d9be4be3a3287369e6f821c73c563debf888a61e624340179f1907c915' 
  AND token = '5XED0gC5BvPEImuYqbs6cufpWkF9SiKykof5kppAiRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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