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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a210251d82fc5e62b64bcdfc048704b5c113fc24ba29a315eaa1eba5e718f160' 
  AND token = '1UrtJZ0sgQpKhS8/9tYiDWfC0j23ifW4nSQ7lmBc31w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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