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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3054d1d0684b2ae3534828c1b825ca699aece1c20b2c0ba20c4f34daa370ab70' 
  AND token = 'fJr3KjS78EKHK6/uld+22j4jqGY3JF+bO/DHK1AOz58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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