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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8788d2bd378e70e3ff6c1d25ba14c23ea7ca5ea7c8e10a6b330537709b43583a' 
  AND token = '+8BsIub6E1BQdqpRIZrXF/+6l2URsWynydJlevk5T9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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