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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049163a428dbc1cc4310268670312f7e97efad5f9d2337fb3376c5db0e963847' 
  AND token = 'sGx0JDJ2j0E4AVfiFclrnOTaY4d4zxMk93kowvldNZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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