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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eea33ae3b55448d02b3f5b18a87787ffa4a644958f2084bb02c0c478d83672e' 
  AND token = 'aWYq8mrrFS6wG+QvE158wQD60fbi2KnOERLXJQih9I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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