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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36422a5763dbf1f956f0f2e72e291d752abf571d3e327b41f92d4a17c67360ee' 
  AND token = '7aegepbRHe26HTrPwN3tiXliPqPzc1bE9EItdPSaNrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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