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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38d4d7a00d91b1669d78bb7afe4e199976ec7b7b482ce84a6876391a8b4caa8' 
  AND token = 'WB3+nffQae74l6Ze8hNuzsbH2amXFE545H4c765dT+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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