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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd372792d03c6f5264c56f7b208680bf4d71824329cd42c1ba0bb7dacd48e710' 
  AND token = 'a3GjQLKoD5MmgjNKB1ndxKBnBB+SydSNKQsEDxZQ24U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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