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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8ec9f7378cd3f95eba77fcb9bc1f2c7773e503fca7961a1b1009468d74e6e9' 
  AND token = 'na4dQWvcdKc+H4wljJmn/1i+GUlrwBG47cXmCVDN8ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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