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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7ae31a627e1088e251b74be3ec0cb05444e424577a66e4a04275981d7e3d84' 
  AND token = '6eHeLfY6bEtVSs5XpF5Iy6f4/4jMQsMm278SuPwXMyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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