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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd32a094f03e37e822bedfebe9430d52d5d8cac7c3d638198074cf25035c3a3' 
  AND token = 'groeoDApdQxXoIvNHIuo8hwaUB6rkN9buI/i6/2Wtag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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