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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b57b2ede29c9728b10b8810ab9fcde8e0696b534d699fae7341da589a0cb9a1' 
  AND token = 'B910U154zXT5zQsZtM4Mp+q6JE3ls/iFRG0hgDPELzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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