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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912cfc69e23941d70377db9679dcd5063d83ae4923e3eb67e0505c79b9fd7c1d' 
  AND token = 'bh6C7nbcliZPEYf5eQya07J4ST3qugn+H3GqVLLfX2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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