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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032c6e154f5aa25ddec4e2d8c59be31cb0d1933fcfc698cbcbea67bbef0a414e' 
  AND token = 'VtZjldhCIS3p8CZiM8geQUNvnXllOjLcPWsk+WtrPgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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