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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcce85e4cab7bdc675b97438a5eafeb4707041450e841dcf47d8f3bb2181418' 
  AND token = '4Wstpx6KKr3J21Da5023hYb/okcsUZLncF7Z8knmABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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