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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f51d00e697fa77dadf7b1ed30d8c8f082ec253746d1ed9bebf3f3ba322387c' 
  AND token = 'h9KUH4ej2u4VzxEDOkTSisuDSEVtIXQIJ1yJ3pAKMtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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