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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771a751605ac21efddd26eef33b1b1d5687c0018255ea851612c970e402b05a0' 
  AND token = '0HOiAst5gRg3SqbaNrZiCQopr3YtBQ4dxfpvbXK0GHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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