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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a559b3b66419bb8b336e9b8c3847d060658969b36e9b27de9764621eb62b889' 
  AND token = '30pRZy27rIWCCf/sdg4fV8z0OR85pGIHaPolD9SDsuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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