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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7549ece6a795b05b61bf1ce2aae1f695e3cbaf3608981dd647cedd256de59780' 
  AND token = 'dcWSc8O857COeBZt9DXdgRLq69Xg3dpmGgbDszb45ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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