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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4e95b87858953ba5adbeebb36aa636ea49c1b52a79aa21f4ed425d67a81984' 
  AND token = 'yiktyUa5yn8ue3wOZ/cbYAP5ZJSWoEsTiFSiK9EF8q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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