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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5f5406a7fc4f3a0dbf3a98a4253bf3dd69644c9eb7183504c7bb174984efaa' 
  AND token = 'lA8C1CJiiRgaRWERV2LNfPSG/m1e2pK3SP0YRKPQIFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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