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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59dca0a243365a1afc64386c02e4c4bd5690a1a8f9dbd9538a3732316d7a0f3' 
  AND token = '+4dovjL4iaAyfXRsZfYmuXiaKnjRU8XVzl7XH4BXEHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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