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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f9803ec0244c7c7f4e42cf83bdb1511d6e3bbf951e01cf220de67766ce1bf5' 
  AND token = 'vL/XxqMtthf/b4Ntb23R6DhlVmjpYHg7bkbZ5UY8XLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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