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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437bed42effbc9c7a849e8310525737791e22e79701bf34a2bc8e76c3ed5f128' 
  AND token = 'Aul+59o0z4i1/ZclYjQ6ph6wbMcr5AHbBAk4Dh8qTWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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