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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bb0671ea0b6304a7dd6c2a6bb4dd9ae4552489715c42294b3876bd44e76509' 
  AND token = 'C+IGeeHVC5DQYBwmxVybU3+HcJmoGsWTVOZbx81EIHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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