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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476fab2be0f0977eaf8ad92cf06f3b8214b2e5c764a0384afbb23f0af6b18683' 
  AND token = 'bwzg/Naew5ItGWNbos2ZFyFicL9LVxqnauICI+Wb5RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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