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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eee901599f0be29faaddd34130a94d6d7d3c98fad75d819cafa3005b814e93f' 
  AND token = 'soomZqP8SXzZDhno7XCmYeuZW+Z/W4CuhHbdGsyIhug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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