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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57059bc55c83f6bd48e5f59c55022a01103d31e1d4b9509498cd9b63a006060b' 
  AND token = 'RJivI2u1rXUI6VgcalQ9qI0pMCHccva07tiw+bAzLZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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