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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b382f35857008aedf4bc7e9538ae65f0c290e8f164863e7e9a14465b8608009' 
  AND token = 'qngfpPSCLx7DLIcciLRi1hhL4Nx1dG/hdNijDc+eiIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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