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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213a46711ed508e4e86916bc67f55704f93af078aff2a0d04af9eb477dd94087' 
  AND token = 'zd8RygCMlt2Gon/LVk/PvezyJDgEKdPtnl/s7535bbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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