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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8721e3a1803d169f77827f6d2ee763efab5a019c9fb16ed504d4d73b0030097' 
  AND token = '04J+t33Go1dlEBBTHkTyXl4ghsvW790y7ICg2K3Ma9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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