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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f4ab931f2cadb6d21e2fc10fca374d88676fd0093ded60ae06a31d1c30fcf2' 
  AND token = 'AnCy4Mzc3wWh8Agk1CfkudzwPNV9li6gohUC8nWXMBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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