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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f67cb8d61ab454b862aeb2156aee39b5404de6ec410091d19b65ba78e06ae1' 
  AND token = 'zIyh5TU4anFdZc9zmxyTUjGM3LMmJNxqiLBH+OChSBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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