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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c1d6263c4f7a9a18d010bfcba926436845a158b0e5c3d2350a0708e8fd3470' 
  AND token = 'nzm/wZomL53ZmOzugoNdye+EeR9TDHw0QtoDHYq8Ufc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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