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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79b120ab59ef74dc8b055c3f118f4ebd01748d3e4e99d5cd7cdeccaaf05e173' 
  AND token = 'lGJHkdWTYZKvoJ0OsF3jH+wshHv2sob92dg3eigerOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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