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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1f9686b59c0cb619595d797cc125e70ccca23ed90c10dec8feac2fe7ca34c9' 
  AND token = 'y+qOLGH3Y2TFEgIFd94/5poEIylp2jd4fBdnwyhjiPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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