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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6a05836573b3b0c5b83bea6b06580b4529a19cb18d5133c67b8fde49f2d938' 
  AND token = 'sA8tug5l1v1m45zAwy1EuXr1iT5JpHNwBqO4GYNekxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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