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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ef6fcda200c1afb403d9e9c1ffcb740ae4713033fb4bae7a273780844c5443' 
  AND token = 'Iri1TdmOk0sQp9e2GN7mcC91m3/HftEiYMggW32xUiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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