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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3ee14f9e8f5bab1387ea794a5e711ba9c64db928050917a34e1ec794500ecd' 
  AND token = 'gTB0PFGsEdqZnMLBDF/YaEWUSttzFr0vQvWicoI5RvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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