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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8842c583d8940c9c02d932dfc4776e788f63d0da643c2a9f6df66a762a66757' 
  AND token = 'cnYaia3WboXqqZoeUNY3yVWyopLWVHVgx/7AemK8Cd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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