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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0554d4884777d7191a91f7f5a25d644307fc7ffacddc18ea3859739c7f781c' 
  AND token = 'sURdy+y6DxhMk1TTjmhcZyAAHMiXzUQDIJ26hP5ckEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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