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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f71cac2cf5f61f76392e4d0af45d15ef712aad28ab9bbc4e60054fc093d1e70' 
  AND token = 'BIpuDC3Z+798UACvJGbWqpzl3e9P0ued3kyhm8Rw+SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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