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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a99edddcf3483e2fe89be4995b922db9e19ba0e0a41fdcd14b1ac6671543b8' 
  AND token = 'oEyfOhwIFukN4leL1uhic+yecDbkfAigKvVV67srz6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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