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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebb891d5adb1e481b5c0909afda2af351bfed0689e36d4b82aba201380b6a1e' 
  AND token = 'X9MGUKNIkxSPjyqA1biEwjYGPHauOW4JEt4WOp6oq1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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